RDOS may refer to:
Regional District of Okanagan-Similkameen, a regional district of British Columbia Data General RDOS, a real-time operating system by Data General since 1972 Cromemco RDOS, the resident operating system on some Cromemco S-100 cards RDOS (Microsoft), a name sometimes used for the Russian versions of MS-DOS 4.01 and 5.00 RDOS (Ekblad), a 32-bit DOS-compatible operating system by Leif Ekblad since 1988
See also DOS (disambiguation) ROS (disambiguation) RTOS, real-time operating system REAL/32